Motor



Nov. 6, 1934.

w, s. ELLIOTT MOTOR Filed M y 1952 vENToR Patented Nov. 6, 1934 MOTORWilliam S. Elliott, Pittsburgh, Pa., assignor to Elliott Company,Pittsburgh, 1a., a corporation of Pennsylvania Application May 16, 1932,Serial No. 611,528 4 Claims. (01. 121-34) The present invention relatesbroadly to rotary motors, and more particularly to motors of the fluidpressure or turbine type having a simpleand compact construction suchthat the parts may be readily assembled or taken down for purposes ofrenewal or repair.

Inmotors of the general character herein contemplated, and as shown forexample in my U. S. Patent 983,034 of January 31, 1911, the construc-.tion has been such as to permit the motor to be bodily moved through atube to be cleaned with the cleaning element carriedand operated by themotor. I have found that in many localities it is not possible toutilize the motor at the most convenient times due to the noise which ismade by the escaping air. The present invention has for one of itsobjects the provision of a combined motor and muffler all disposedwithin a single shell or casing and possessing all of the necessary 20.advantages with respect to compactness, size and accessibility of theparts.

In the accompanying drawing I have shown for purposes of illustrationonly, a preferred embodiment of my invention. In the drawing:

Figure 1 is a longitudinal sectional view through a combined motor andmuffler embodying the invention, the section being taken along the lineI-I of Figure 2 looking in the direction of the arrows, with the rotorin elevation;

Figure 2 is a transverse sectional View on the line II--II of Figure 1,looking in the direction of the arrows;

Figure 3 is a detail sectional view along the line III-III of Figure 2,looking in the direction of the arrows, the rotor being shown inelevation;

Figure 4 is a detail sectional view along the line IV--IV of Figure l,looking'in the direction of the arrows; and

Figure 5 is an end elevational view of the right hand end of thestructure illustrated in Figure 1.

While the drawing illustrates a motor embodying my invention andespecially adapted for use in operatingboiler tube cleaning tools, itwill be understood that the utility of the invention is not limited tothe particular use to which reference has been made.

In accordance with the present invention, the motor comprises an outercasing or shell 2 formed at its opposite ends with heads or enlargements3 and 4, respectively. If the motor is to be utilized for the purpose ofoperating cleaning tools, the motor being carried through the tubes withthe tools, the casing or shell together with the heads, are preferablyof cylindrical form, as shown; but for other purposes the shape of thecasing or shell and the heads may be modified as desired. In the case ofa boiler tube cleaner motor, the heads constituteguiding means for themotor in moving through the tubes and protect the main shell fromcontact with the interior of the tubes. In

such constructions the head 4 may be considered as the front head,having regard to the direction of movement of the motor, while the head3 may be regarded as the rear head.

Disposed concentrically with the casing 2 is a rotor shaft 5 journaledin a front bearing 6, an intermediate bearing 7 and a rear bearing 8,all of which are preferably in the form of removable bushings.

The front bushing 6 is adapted to be slipped axially into positionwithin a central opening 9 in the front end of the shell or casing 2 andis formed with a flange 10 seating against a shoulder 11 in the casing.

The front bushing 6 having been slipped into position by endwisemovement through the easing, a perforated shell 12 is similarly applied.This shell at one end is adapted to fit over a projection 14 formed onthe bushing 6 and bear against an inwardly facing shoulder 15 thereon.This constitutes a support for one end of the perforated shell. At itsintermediate portion it is provided with a circumferentially extendingflange 16 adapted to tightly engage the interior of the casing 2 andform both a bearing for the perforated shell and a substantiallygas-tight closure between the outer casing and the perforated shell 12.

closure disk 17 shaped to constitute a closure for one end of a cylinder18 fitting within the easing 2. This cylinder, as shown moreparticularly in Figure 2, provides a chamber 19 eccentrically'dispos'edwith respect to the axis of the shaft 5 and adapted to cooperate with apiston 20 extending transversely of and slidably 1nounted within asuitable opening in the rotor 21 preferably formed integrally with theshaft 5.

The opposite end of the cylinder 18 is closed by a second closure disk22, similar to the disk 1'7 and adapted to be applied by relative axialmovement. Bearing against the closure disk 22 is a flange 23 formed onthe bushing 8. This bushing is preferably of the split type adapted tobe fitted around the reduced neck 24 of the shaft so as to constitute athrust bearing therefor. For supporting the split bushingB and holdingthe parts thereof in the desired relationship to the reduced neck 24 ofthe shaft, there is provided a cap member 25 which may beforced intoposition by a connector 26. This connector is provided with anexternally threaded portion 27 adapted to be received by internalthreads within the rear head 3 of the casing 2, and with an internallythreaded opening 28 adapted to be connected to a suitable source offluid under pressure.

The interior of the connector 26, and the rear end portion of the cap 25are shaped to form an admission space or chamber 29 from which anadmission port 30 in the cap leads to a similar port 31 in the rearbushing 8, which in turn alines with a port 32 in the closure disk 22communicatingwith a longitudinally extending in let port 33 in thethickened wall. of the cylinder 18. The inlet port 33 communicates withthe piston chamber 19 through a plurality of cross ports as disposedlengthwise of the rotor.

Formed in and partially intersecting the port 30 is an undercutprojection 35, as shown more particularly in Figure 3, which is adaptedto receive lubricant carri d by the fluid travelling through the port inthe direction indicated by the arrows and deliver such lubricant througha passage 36 to the neck 24.

By reference more particularly to Figures 1 and 3. of the drawing, itwill be noted that a space- 37 is formed between the cap 25 and thecollar 38 on the roll neck 24, which space communicates with anobliquely extending passage 39 connecting at its outer end with adischarge opening 40 in the wall of the casing and effective forpreventing pressure accumulation within the cap such as would tend tosubject the shaft to an undue end thrust.

The cylinder 18 may be provided with a longitudinally extending exhaustport as disclosed in my patent referred to, or may have one side thereofcut away, as indicated in Figure 2, to provide an exhaust port 41communicating with the piston chamber 19 through a plurality of crossports 22 similar to the admission ports 34.

In operation, driving fluid such as compressed air under the necessarypressure will be delivered to the chamber 29, from which it will pass byway of ports 30, 31, 32 and 33 to the cross ports 34 as indicated by thearrows in Figures 2 and 3. This pressure effective against the piston 20will effect rotation of the shaft 5 in a counter-clockwise direction asviewed in Figure 2, until the shaft has rotated to such an extent as toun cover the cross outlet ports 42. The fluid discharged through theseports, and travelling lengthwise of the casing 2 as indicated by thearrows in Figure 1, will come into the zone 43 surrounding the rear endof the'perforated shell 12. From this zone it will pass inwardly individed condition through a plurality of perforations 44 into a zone 45surrounding the shaft. It will thence travel longitudinally into anaxially spaced zone 46 from which it will flow outwardly in distributedcondition through a plurality of perforations 47 in the front end of theshell 12. Communicating with the space 48 around the perforations 4'7 isa series of axially extending outlets l9 uniformly disposed around thefront bushing 9. It will be apparent that the intermediatecircumferentially extending flange 16 prevents the used fluid fromtravelling directly from the space 4:3 to the space 48 withouttravelling the angular or tortuous path provided by the perforations a4and 4'7. The annular chambers 43, 45 and 46 form an expansion chamber inwhich the air or other non-condensable elastic gases expand. Due to thepath through which the fluid must travel, there is provided an efiicientmufliing or silencing. This permits the tool to be utilized as a unit atany desired time, and under any usual conditions and in any localitywithout any danger of disturbing people in adjoining departments or inthe neighborhood.

For sake of compactness, and in order to maintain the desired minimumoverall diameter of the parts, the motor chamber and silencing chamberare preferably arranged in tandem. The present invention, however,contemplates the provision of a motor, and more especially a fluidoperated motor, together witha silencer or mufiier in a common casing.By reason of this construction the casingwhich encloses the motor alsoconstitutes a casing for the muffler, thereby performinga dual functionand keeping the exhaust fluid confined until it has been subjected tothe desired silencing action. These novel features of construction givean advantageous operating condition for the reasons set forth.

While I have herein illustrated and described a preferred embodiment ofmy invention, it will be understood that changes in the construction,operation and relationship of the parts may be made without departingeither from the spirit of my invention or the scope of my broaderclaims.

I claim:

1. A rotary tube cleaner motor employing a non-condensable elastic fluidand adapted to be moved through a tube to be cleaned and comprising acasing of a size approaching the internal diameter of the tube to becleaned, a rotor in the casing, a: connection for conducting anon-condensable elastic fluid to the rotor, an exhaust channel. for therotor and a muffler in tandem with the motor and movable therewiththrough the tube, said muflier having an expansion chamber arranged toreceive the non-condensable elastic fluid from the motor exhaustchannel.

2. A rotary tube cleaner motor having a rear connection to receiveimpelling fluid, an exhaust channel in. its forward portion, and amufiier in tandem with the motor and in front thereof, said motor havinga shaft extending forwardly through the muffler and adapted to receiveacleaning head in front of the muflier, the muffier having an expansionchamber to receive exhaust fluid from the exhaust channel of the motor.

3. A rotary tube cleaner motor adapted to be 1 moved through a tube tobe cleaned and comprising a. generally cylindrical casing whose externaldiameter approaches the internal diameter of the tube to be cleaned, arotor in the casing and means for conducting impelling fluid to and awayfrom said rotor, and a mufiier connected with the motor and movabletherewith through the tube and having an expansion chamber adapted toreceive the exhaust fluid from the motor.

4. A rotary tube cleaner motor adapted to be moved through a tube to becleaned and comprising a generally cylindrical casing whose externaldiameter approaches the internal diameter of the tube to be cleaned, arotor in the casing and means for conducting a non-condensable gaseousimpelling fluidto and away from said rotor, and a muffler connected withthe motor and movable therewith through the tube and having an expansionchamber adapted to receive the exhaust fluid from the motor and todischarge the same in gaseous form.

WILLIAM S. ELLIOTT.

